So you're in a hotel room with your Mac laptop and your roommate's got a PC and there's one Ethernet jack. What do you do? You plug in your Mac and get to sharing the internet love, that's what you do! In System Preferences, go to Sharing and on the Internet tab, click the source (Ethernet) and the way the other computer will connect (most likely Wi-Fi). Then click the checkbox next to "Internet Sharing" in the left-hand column to get started.

This'll create a Wi-Fi hotspot emanating from your Mac that you can connect any other device to.

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If you don't want everyone else nearby sucking down your bandwidth, click the "Wi-Fi" button to set a password on your ad-hoc network, before you hit the start button. Give your roomie the password and from there you're good to go.